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What does an activity diagram describe? A workflow, either organizational or computational. UML diagrams are of structural or behavioural type. In which category does a class diagram fall? Structural. Wanting to describe a user login procedure from a logical point of view, what diagram would be best suited? A sequence diagram. UML diagrams are of structural or behavioural type. In which category does a use case diagram fall? Behavioural. UML diagrams are of structural or behavioural type. In which category does a sequence diagram fall? Behavioural. UML diagrams are of structural or behavioural type. In which category does an activity diagram fall? Behavioural. UML diagrams are of structural or behavioural type. In which category does an state diagram fall? Behavioural Wanting to describe a break down of users interaction with the system, what diagrams would be best suited? Use-case diagrams. UML is said to be a 4+1 (views) model. In essence, what does the use case view describe? The funcionalities of the system, from an outside perspective. UML is said to be a 4+1 (views) model. In essence, what does the logical view describe? The abstractions of the system's parts. UML is said to be a 4+1 (views) model. In essence, what does the process view describe? The processes within the system. UML is said to be a 4+1 (views) model. In essence, what does the development view describe? How the system is organized into modules and components. Wanting to describe how a set of business (model) entities relate to one another, what diagram would be best suited? A class diagram. UML is a formal, comprehensive and standard modelling language. Why is it so useful to us software engineers? Because it describes all aspects of a system in a standard way and without misunderstandings to any peers anywhere in the world. UML is said to be a 4+1 (views) model. In essence, what does the physical view describe? How the system is mapped into real entities.